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this post was submitted on 18 Jul 2026<br>3 points (64% upvoted)<br>shortlink:

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Open Source A full offline voice agent in 1.2 GB of RAM — say a command, the phone executes it and answers in 0.9 s (demo APK + Apache-2.0 SDK) (i.redd.it)

submitted 12 hours ago * by ivan_digital<br>2 comments<br>share<br>save<br>hide<br>report

I maintain speech-android. We published a demo app that runs a complete voice-command loop locally: Silero VAD → streaming Parakeet 120M STT with end-of-utterance detection → FunctionGemma 270M for structured tool calls (LiteRT-LM) → the actual device action → streaming Pocket TTS. No network needed after the models download.

Measured on a Galaxy S23 Ultra (2026-07-17), timed from the moment you stop speaking: 217 ms to the final transcript, 294 ms for the tool call (12-run mean), 179 ms to the first TTS sample — 908 ms total until the phone starts answering. The whole app sits at 1,116 MB PSS.

Architecture-wise it's a thin Kotlin SDK over a ~250-line JNI bridge into a C++17 pipeline engine; ONNX Runtime for the speech models, LiteRT-LM for the router. The app only exposes tools that are valid for the current device state, which is what keeps a 270M model reliable as a router.

90-second demo: https://youtu.be/7L7_Uvvxtv0 Source + signed APK: https://github.com/soniqo/speech-android

The open question I keep going back and forth on: the agent loop runs in a foreground service holding...